Double Jacketed Gasket has characteristic of metallic and nonmetal, with excellent sealing performance, especially made of each kind of complex shape. Double Jacketed Gasket with greatness diameter not easy to fall apart and not easy to damnify, the most temperature is 800, the pressure is ≤6.4Mpa，the leakiness rate is 1╳10-3cm3/S. If both of sides be adhered flexible graphite, the leakiness rate is 1╳10-5cm3/S。